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Incurred But Not Reported (IBNR)

Refers to a financial accounting of all services that have been performed but, as a result of a short period of time, have not been invoiced or recorded. Estimates of costs for medical services provided for which a claim has not yet been filed. Refers to claims which reflect services already delivered, but, for whatever reason, have not yet been reimbursed. These are bills “in the pipeline.” This is a crucial concept for proactive providers who are beginning to explore arrangements that put them in the role of adjudicating claims–as the result, perhaps, of operating in a sub-capitated system. Failure to account for these potential claims could lead to some very bad decisions. Good administrative operations have fairly sophisticated mathematical models to estimate this amount at any given time.